1. First update to the latest development version which you can download from the download page if you scroll down a bit, there have been a lot of fixes and changes to how the Wii menu is handled since the stable release more than a year and a half ago. It now also has a function to repair the broken NAND.
2. WiiConnect24 has been discontinued

Wikipedia Wrote:By June 28, 2013, Nintendo had discontinued almost all of the WiiConnect24 Services. The Wii Shop channel was unaffected, however this was not a true user of WiiConnect24 in Nintendo's terms.